<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        function App(){
            const [message,useMessage]=React.useState("");
            const iptEle = React.useRef();
            const getUserInput=()=>{
                console.log(iptEle);
                const userInput = iptEle.current.value;
                useMessage(userInput);
            }
            return <div>
                <h1>App组件输入的内容:{message}</h1>
                <input type="text" ref={iptEle}/>
                <button onClick={getUserInput}>获取输入内容，并展示</button>
                </div>
        }
        ReactDOM.createRoot(document.getElementById("app")).render(<App />);
    </script>
</body>
</html>